Answer:
Step-by-step explanation:
it's obvious that 3·3·3·3=81
or you can do the prime factorization of 81
A
its step 4
12
Factors of 30: 1,2,3,5,(6),10,15,30
Factors of 42: 1,2,3,(6),7,14,21,42
30 divided by 6, 42 divided by 6
(5) + (7)= 12
Answer
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